Improvement in door-locks



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thinned tapes @aient @titille Letters Patent No. 92,502, dated July 13,1869."

IMPROVEMENT IN DOOR-LOCKS.

The Schedule referred to in these Letters Patent and making part of thesame.

To all whom it may concern Be it known that I,- THOMAS B. WonRaLL, ofFrankford, Philadelphia county, Pennsylvania, have inventeda new anduseful Improvementin Burglar-Proof Locks; and I do hereby declare thatthe following is a full and exact description thereof, reference beinghad to the accompanying'drawings, and to the letters of reference markedthereon.

The nature of my invention consists of interlocking bars, arranged inthe same plane, so as not to increase the depth of the lock, the -saidbars being in combination with the locking-bolts, and havingcrossfgrooves through which the bolts pass as they are shot outward andinward; and when the bolts are to be fastcned in their outward position,the said cross-bars are moved by suitable mechanism so as to bring theirribs into cross-grooves of the bolts, the bars being susceptible ofbeing moved variable distances, andot indefinite changes in theirrelative movements. No person but thebne who has adjusted the bars couldpossibly open the lock, not knowing what distance to move each rack, soas to make their grooves coincide with the bolts, as will be understoodby the following description In the accompanying drawings, which make apart of this specification- Figure l is a, face view of the inside of adoor and the improved lock.

v Figure 2 is a vertical section at the line a: :t of fig. 1.

Figure 3 is an outside face view of the door. Figure 4 is a perspectiveview of the key I.

Figure 5 is a like view of one of the sliding bars J.

Figure 6 is a view of the 'supporting bar H reversed. Like letters inall the figures indicate the same parts.

A is a door;

B B are vertical bolts; and

G, a bolt at right angles thereto.

'Ihe bolts B B slide in slots of the cross-guides The bolt G, andparallel rack l), are guided by the strips b b.

lil is a pinion on the central pin F, which has a head, c, which turnsfreely in the plate G, which is sunk into the face of the door A, andconfined by means of screws d, when the door is made of wood, as represcntedin the drawings. The inner end oi' the pin is supported in thehole 1 oi' the supporting-bar H, as seen in iig. 2, but which is leftoff of iig. 1.v rlhe pinion E gears into the teeth of the bolts B B, andalso into those ofthe bolt C and the -rack D, so that by turning thepinion by means ot' the key I, as represented in tig. 4, the bolts areshot outward and upward simultaneously. l

- I have two or more sliding bars, J, which are guided by the rebatcdstrips e, and arc operated by means of the pinions E E', on the pins FF', whose heads ff turn in the lplate G. The inner ends of the pins aresupported by the bar H, as seen in iig. 2.

I arrange the said sliding bars J in the same plane, so that anydesirable number may be used without increasing the depth of lthe lock,giving Acompactness to .the latter, and making it susceptible'of muchcheaper construction than when the bars are arranged in differentplanes, consequent upon` the peculiar construction of the locks hithertoinvented.

Projecting from the sliding bars J, are ribs g, which have cross-grooveslaas seen in iig. 5, equal in length to the distance across the bolts BB, so that when they are brought to coincide with the bolts, the lattermay be moved either way. A

When the door is locked by shifting said bars either way, the ribs y arebrought into the cross-grooves 'i of the bolts B B, to hold themsecurely.

The plate Gr, above described, has dots or indentations, j, concentricwith the pins F of theI pinion' E', so that by observing which dot orindentation the pointer It oi' the key Ipoints to when the grooves h ofthe bars J respectively coincide with the bolts B B, and then turningthe pinions either way one or more times, or a certain distance around,until the ends of the bars bear against the stops l, the adjustment willbe understood. Each bar will haveto be moved different from the others,to make the cross-groove h coincide with the bolts B B, to allow them tobe shot back, as said grooves are of variable distances from the end ofthe bars.

As the length of the grooves It are equal to the distance across thebolts B B, unless the racks are moved.

so as to make the grooves coincide with the bolts, the latter will beheld fast, or if either of the bars is not brought so as to have thegroove inline with the bolts, they will still be held fast, Hence it isimpossible for any one who has not a previous accurate knowledge of theconstruction and adjustment ofthe bars to open the lock.

If desired, circular racks may take the place of the straight bars J.

The bolts B B are of such length that when they are shot inward in theunlocking of the door, their ends come against the cross-head of eachother 'to arrest their motion, and in locking they are arrested by thestop m.

At the same time the cross-head of the cross-bolt C cornes against thecontiguous end of the rack l). This latter provision might be dispensedwith, as'the bolt C cannot move further when the motion of thel bolts BB is arrested.

lf desired, the rack D may be left oti, as its principal use is toequalize the action of the pinion E.

'By varying the distance of the cross-grooves ha, of; ,cach set ofthebars J from the ends of .the same, an"

indeinite number of locks maybe made so unlike each tially as described,and operating in relation to each other as to make it impossible foraperson familiar other as aboveset forth.

lwith one to open any of the others. In testimony that the above is myinvention, I have The lock may be used for a night-,latch withsnitahereunto set my hand and axed my seal this 24th vble modification.day of February, A. D. 1869.

What I claim as new, and desire to secure by Let- ,THOS. B. WORRELL. [L5.] ters Patent, is y vTwo or more interlocking bars, J, having recessesh, Witnesses: in combination with the locking-bolts B, the said barsSTEPHEN Us'rIcK,`

and bolts being constructed and arranged substan- WM. LARZELERE.

